I don't have a good solution to make it easier for you to hang your bike. However, if the building manager does not relent, federal American Disabilities Act (ADA) requirements cover you. ADA requires that equal accommodations be provided for those with disabilities.
With this specific case, the height of the hook is not within ADA standards. ADA Section 4.2.5 states: If the clear floor space only allows forward approach to an object, the maximum high forward reach allowed shall be 48 in. The hook should be lowered to 48" or some other accommodations need to be made.
This provision has to do with "Minimum Clear Floor Space for Wheelchairs." I don't see what it ha...
How busy is the bike room?
If I saw a nice note explaining the situation I would hang if it in the morning the bike or take it down at the end of the day. A couple of cookies every now and then would probably be more than fair. Doesn't solve all your problems but might help while you figure things out.
And a small ramp might work, the back wheel doesn't look too far off the ground and if you can get the bike on it's back wheel you might be able to roll it up and down.
Like Paul said, this might be a problem that can be solved with human engineering and designing a proper lifting technique that works for you and your physical limitations.
Lifting a bicycle can be made significantly easier by using a technique that allows you to control the CG of the bike and to find proper handholds so that when the mass of the bike is elevated it doesn't take a lot of power or strength.
One easy way to get a bike vertical is to apply the back brake and to simply pull back on the handlebars until the front wheel is directly above the rear, pivoting backwards over the locked rear wheel. If one first uses a bungie-cord to secure the front wheel to the frame downtube it can not twist around on you (or spin) while you are raising the bike.
At this point you have hoisted the CG of the bike upwards by a significant amount so that the next step will not require a very large distance to reach the hook. If one continues to hold the rear brake fast with the offhand the strong hand/arm can grab the lower portion of the frame downtube or the seat tube and simply raise the bike up, with the off-hand balancing it so that it doesn't tilt while raising it.
Lifting a bike can be done with brute force, or it can be done with finesse by using physics in your favor instead of fighting against it. Gripping the bike in the proper place so that you can hold it without needing to balance it with most of your effort takes a lot of the work out of it.
Knowing where to grab the bike is most of the battle.